The primary breathing control centers in the brain are located in the ______.
A. cerebral cortex
B. hypothalamus
C. medulla
D. pituitary
Ans: C. medulla
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Antiviral drugs are often difficult to develop, largely because
A. viruses are more abundant in the body than bacterial cells. B. viruses are obligate intracellular parasites so the drugs must enter the host cell and often cause toxic side effects in order to destroy the virus. C. viruses are more pathogenic than bacterial cells. D. viruses are much smaller than bacterial cells.
Which lineage of Cnidarians includes adults that are predominately medusae and the true jellyfishes?
a. Anthozoa b. Hydrozoa c. Scyphozoa d. Cubozoa